[PATCH 1/5] xfs: Propagate dentry down to inode_change_ok()

Jan Kara
2016-08-03T11:28:22Z

To avoid clearing of capabilities or security related extended
attributes too early, inode_change_ok() will need to take dentry instead
of inode. Propagate dentry down to functions calling inode_change_ok().
This is rather straightforward except for xfs_set_mode() function which
does not have dentry easily available. Luckily that function does not
call inode_change_ok() anyway so we just have to do a little dance with
function prototypes.

Acked-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>
---
fs/xfs/xfs_file.c | 2 +-
fs/xfs/xfs_inode.c | 2 +-
fs/xfs/xfs_ioctl.c | 2 +-
fs/xfs/xfs_iops.c | 94 ++++++++++++++++++++++++++++++++++++------------------
fs/xfs/xfs_iops.h | 3 +-
5 files changed, 68 insertions(+), 35 deletions(-)

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index ed95e5bb04e6..79205202a29a 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -973,7 +973,7 @@ xfs_file_fallocate(

iattr.ia_valid = ATTR_SIZE;
iattr.ia_size = new_size;
- error = xfs_setattr_size(ip, &iattr);
+ error = xfs_vn_setattr_size(file_dentry(file), &iattr);
if (error)
goto out_unlock;
}
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 8825bcfd314c..c96f3d21b2bc 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -1709,7 +1709,7 @@ xfs_inactive_truncate(
/*
* Log the inode size first to prevent stale data exposure in the event
* of a system crash before the truncate completes. See the related
- * comment in xfs_setattr_size() for details.
+ * comment in xfs_vn_setattr_size() for details.
*/
ip->i_d.di_size = 0;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 9a7c87809d3b..e5fae04298f6 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -714,7 +714,7 @@ xfs_ioc_space(
iattr.ia_valid = ATTR_SIZE;
iattr.ia_size = bf->l_start;

- error = xfs_setattr_size(ip, &iattr);
+ error = xfs_vn_setattr_size(file_dentry(filp), &iattr);
break;
default:
ASSERT(0);
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index ab820f84ed50..f5db392e7d1e 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -542,6 +542,30 @@ xfs_setattr_time(
inode->i_mtime = iattr->ia_mtime;
}

+static int
+xfs_vn_change_ok(
+ struct dentry *dentry,
+ struct iattr *iattr)
+{
+ struct inode *inode = d_inode(dentry);
+ struct xfs_inode *ip = XFS_I(inode);
+ struct xfs_mount *mp = ip->i_mount;
+
+ if (mp->m_flags & XFS_MOUNT_RDONLY)
+ return -EROFS;
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return -EIO;
+
+ return inode_change_ok(inode, iattr);
+}
+
+/*
+ * Set non-size attributes of an inode.
+ *
+ * Caution: The caller of this function is responsible for calling
+ * inode_change_ok() or otherwise verifying the change is fine.
+ */
int
xfs_setattr_nonsize(
struct xfs_inode *ip,
@@ -558,21 +582,6 @@ xfs_setattr_nonsize(
struct xfs_dquot *udqp = NULL, *gdqp = NULL;
struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL;

- trace_xfs_setattr(ip);
-
- /* If acls are being inherited, we already have this checked */
- if (!(flags & XFS_ATTR_NOACL)) {
- if (mp->m_flags & XFS_MOUNT_RDONLY)
- return -EROFS;
-
- if (XFS_FORCED_SHUTDOWN(mp))
- return -EIO;
-
- error = inode_change_ok(inode, iattr);
- if (error)
- return error;
- }
-
ASSERT((mask & ATTR_SIZE) == 0);

/*
@@ -743,8 +752,27 @@ out_dqrele:
return error;
}

+int
+xfs_vn_setattr_nonsize(
+ struct dentry *dentry,
+ struct iattr *iattr)
+{
+ struct xfs_inode *ip = XFS_I(d_inode(dentry));
+ int error;
+
+ trace_xfs_setattr(ip);
+
+ error = xfs_vn_change_ok(dentry, iattr);
+ if (error)
+ return error;
+ return xfs_setattr_nonsize(ip, iattr, 0);
+}
+
/*
* Truncate file. Must have write permission and not be a directory.
+ *
+ * Caution: The caller of this function is responsible for calling
+ * inode_change_ok() or otherwise verifying the change is fine.
*/
int
xfs_setattr_size(
@@ -759,18 +787,6 @@ xfs_setattr_size(
uint lock_flags = 0;
bool did_zeroing = false;

- trace_xfs_setattr(ip);
-
- if (mp->m_flags & XFS_MOUNT_RDONLY)
- return -EROFS;
-
- if (XFS_FORCED_SHUTDOWN(mp))
- return -EIO;
-
- error = inode_change_ok(inode, iattr);
- if (error)
- return error;
-
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
ASSERT(S_ISREG(inode->i_mode));
@@ -942,16 +958,32 @@ out_trans_cancel:
goto out_unlock;
}

+int
+xfs_vn_setattr_size(
+ struct dentry *dentry,
+ struct iattr *iattr)
+{
+ struct xfs_inode *ip = XFS_I(d_inode(dentry));
+ int error;
+
+ trace_xfs_setattr(ip);
+
+ error = xfs_vn_change_ok(dentry, iattr);
+ if (error)
+ return error;
+ return xfs_setattr_size(ip, iattr);
+}
+
STATIC int
xfs_vn_setattr(
struct dentry *dentry,
struct iattr *iattr)
{
- struct xfs_inode *ip = XFS_I(d_inode(dentry));
int error;

if (iattr->ia_valid & ATTR_SIZE) {
- uint iolock = XFS_IOLOCK_EXCL;
+ struct xfs_inode *ip = XFS_I(d_inode(dentry));
+ uint iolock = XFS_IOLOCK_EXCL;

xfs_ilock(ip, iolock);
error = xfs_break_layouts(d_inode(dentry), &iolock, true);
@@ -959,11 +991,11 @@ xfs_vn_setattr(
xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
iolock |= XFS_MMAPLOCK_EXCL;

- error = xfs_setattr_size(ip, iattr);
+ error = xfs_vn_setattr_size(dentry, iattr);
}
xfs_iunlock(ip, iolock);
} else {
- error = xfs_setattr_nonsize(ip, iattr, 0);
+ error = xfs_vn_setattr_nonsize(dentry, iattr);
}

return error;
diff --git a/fs/xfs/xfs_iops.h b/fs/xfs/xfs_iops.h
index a0f84abb0d09..0259a383721a 100644
--- a/fs/xfs/xfs_iops.h
+++ b/fs/xfs/xfs_iops.h
@@ -33,6 +33,7 @@ extern ssize_t xfs_vn_listxattr(struct dentry *, char *data, size_t size);
extern void xfs_setattr_time(struct xfs_inode *ip, struct iattr *iattr);
extern int xfs_setattr_nonsize(struct xfs_inode *ip, struct iattr *vap,
int flags);
-extern int xfs_setattr_size(struct xfs_inode *ip, struct iattr *vap);
+extern int xfs_vn_setattr_nonsize(struct dentry *dentry, struct iattr *vap);
+extern int xfs_vn_setattr_size(struct dentry *dentry, struct iattr *vap);

#endif /* __XFS_IOPS_H__ */